class RuboCop::Cop::Style::MapToSet

def on_send(node)

def on_send(node)
  return unless (to_set_node, map_node = map_to_set?(node))
  message = format(MSG, method: map_node.loc.selector.source)
  add_offense(map_node.loc.selector, message: message) do |corrector|
    # If the `to_set` call already has a block, do not autocorrect.
    next if to_set_node.block_node
    autocorrect(corrector, to_set_node, map_node)
  end
end